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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Objects, Functions, and Classes	25%	- Prototypal inheritance - Variable scope and closures - Object creation and manipulation - Higher-order functions - Arrow functions - ES6 classes and inheritance - Execution flow and context - Function declarations and expressions - Modules and decorators
Debugging and Error Handling	7%	- Console methods for debugging - Error handling techniques (try/catch/finally) - Custom error types - Breakpoints and code inspection
Browser and Events	17%	- Browser Developer Tools usage - DOM manipulation - Browser-specific APIs - Event propagation (bubbling and capturing) - Interacting with forms and user input - Event handling and listeners
Testing	7%	- Test coverage and reliability - Test effectiveness evaluation - Unit testing concepts - Writing and modifying unit tests
Variables, Types, and Collections	23%	- JSON parsing and manipulation - Arrays and collections - Type coercion and conversion - Strings, numbers, and dates - Variable declarations and initialization - Truthy and falsy evaluations - Primitive and complex data types
Asynchronous Programming	13%	- Event loop and execution flow - Async/Await syntax - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Callbacks
Server Side JavaScript	8%	- Node.js fundamentals - Server-side JavaScript implementations - Package management (npm) - CLI commands - Core Node.js modules

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q102-Q107):

NEW QUESTION # 102
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?

A. console.getTime ()
B. console. timeLog ()
C. console.timeStamp ()
D. console.trace()

Answer: B

NEW QUESTION # 103
A developer wants to create an object from a function in the browser using the code below.
What happens due to lack of the new keyword on line 02?

A. The n variable is assigned the correct object but this- remains undefined.
B. Window. n is assigned the correct object.
C. The a variable is assigned the correct object.
D. Window. === name is assigned to ''hello'' and the variable a n remain undefined.

Answer: D

NEW QUESTION # 104
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method,
Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers

A. Black box
B. Stubbing
C. White box
D. Substitution

Answer: C,D

NEW QUESTION # 105
Refer to the following code:

What is the output of line 11?

A. ["foo", "bar"]
B. ["bar", "foo"]
C. ["foo:1", "bar:2"]
D. [1,2]

Answer: A

NEW QUESTION # 106
Given the code below:

What is logged to the console'

A. 1 2 3 4 5
B. 2 5 3 4 1
C. 1 2 5 3 4
D. 2 5 1 3 4

Answer: B

NEW QUESTION # 107
......

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